KR20230097477A - Touch display device, touch circuit, and touch driving method - Google Patents

Abstract

Embodiments of the present disclosure relate to a touch display device, a touch driving circuit, and a touch driving method, and more particularly, a display panel including a plurality of touch electrodes, and a plurality of scans on the display panel through a plurality of gate lines. A gate driving circuit for supplying signals, a touch driving circuit for sensing touch sensing according to capacitance changes of the plurality of touch electrodes, an overlapping distortion section in the display driving period, and a transition distortion section between the display driving period and the touch driving period. It is possible to provide a touch display device including a power management circuit for supplying compensation voltages of different levels to the plurality of touch electrodes.

Description

Touch display device, touch driving circuit and touch driving method

Embodiments of the present disclosure relate to a touch display device, a touch driving circuit, and a touch driving method.

With the development of multimedia, the importance of flat panel display devices is increasing. In response to this, flat panel display devices such as a liquid crystal display, a plasma display panel, and an organic light emitting display have been commercialized.

In addition, when a touch panel is laminated on such a display device and electrical characteristics such as resistance or capacitance change at a touch point where a hand or a stylus pen is in contact, the touch point is sensed and the touch point is responded to. A touch display device that outputs information or performs calculations is widely used.

Such a touch display device is one of the user interfaces, and its application range is expanding to small portable terminals, office equipment, mobile devices, and the like.

However, when a separate touch panel is laminated on such a touch display device, the thickness of the display device becomes thick, so there is a limit to manufacturing it thinly, the transmission efficiency of light decreases while passing through the laminated touch panel, and the production cost increases. There are downsides. In order to solve this problem, an advanced in-cell touch (AIT) type display device in which touch electrodes are embedded in a pixel region of a display panel has recently been proposed.

Meanwhile, as the size and resolution of such a touch display device increase, the load of the touch electrodes embedded in the display panel increases. Accordingly, there is a problem in that distortion occurs in the direct current voltage supplied to the touch electrodes, causing errors in images displayed on the display panel.

Accordingly, the inventors of the present specification can provide a touch display device, a touch driving circuit, and a touch driving method capable of reducing DC voltage distortion caused by a load of a touch electrode.

Embodiments of the present disclosure are a touch display device capable of effectively reducing DC voltage distortion by classifying DC voltage distortion according to characteristics and applying a compensation voltage corresponding to the DC voltage distortion characteristics, and a touch drive. A circuit and a touch driving method may be provided.

In addition, embodiments of the present disclosure classify DC voltage distortion according to a section in which display driving and touch driving alternate, and apply a compensation voltage corresponding to a section in which DC voltage distortion occurs, thereby effectively distorting the DC voltage. A touch display device capable of reducing the phenomenon, a touch driving circuit, and a touch driving method can be provided.

In addition, embodiments of the present disclosure effectively reduce DC voltage distortion by classifying DC voltage distortion by reflecting the structure of a touch electrode and applying a compensation voltage corresponding to a region where DC voltage distortion occurs. It is possible to provide a touch display device, a touch driving circuit, and a touch driving method.

Embodiments of the present disclosure include a display panel including a plurality of touch electrodes, a gate driving circuit supplying a plurality of scan signals to the display panel through a plurality of gate lines, and touch sensing according to a change in capacitance of the plurality of touch electrodes. A touch including a touch driving circuit that senses, and a power management circuit that supplies compensation voltages of different levels to a plurality of touch electrodes during an overlapping distortion period within a display driving period and a transition distortion period between the display driving period and the touch driving period. A display device may be provided.

Embodiments of the present disclosure provide a touch sensing circuit for supplying a touch driving signal to a plurality of touch electrodes included in a display panel through a plurality of touch lines and receiving a touch sensing signal from the plurality of touch electrodes, and a touch according to the touch sensing signal. A touch controller that detects presence and calculates touch coordinates, and compensates for supplying compensation voltages of different levels to a plurality of touch electrodes in the overlapping distortion section in the display driving period and the transition distortion section in the display driving period and the touch driving period. A touch driving circuit including a voltage generating circuit may be provided.

Embodiments of the present disclosure provide a gate driving circuit for supplying a scan signal to a display panel including a plurality of touch electrodes, a touch driving signal for supplying a touch driving signal to the display panel, and a touch sensing signal received in response to the touch driving signal. In a touch driving method of a touch display device including a touch driving circuit for sensing, determining overlapping distortion of a DC voltage occurring in an overlapping distortion section, and determining transition distortion of a DC voltage occurring in a transition distortion section Dividing the transition distortion period into a first transition distortion period and a second transition distortion period, an overlap compensation voltage applied to the overlap distortion period, a first transition compensation voltage applied to the first transition distortion period, and A touch driving method may include generating a second transition compensation voltage applied to two transition distortion periods, and applying a compensation voltage to an overlapping distortion period and a transition distortion period.

According to embodiments of the present disclosure, it is possible to provide a touch display device, a touch driving circuit, and a touch driving method capable of reducing DC voltage distortion caused by a load of a touch electrode.

In addition, according to embodiments of the present disclosure, a touch that can effectively reduce DC voltage distortion by classifying DC voltage distortion according to characteristics and applying a compensation voltage corresponding to the DC voltage distortion characteristics A display device, a touch driving circuit, and a touch driving method may be provided.

In addition, according to the embodiments of the present disclosure, DC voltage distortion is classified according to a section in which display driving and touch driving are alternated, and a compensation voltage corresponding to a section in which DC voltage distortion occurs is applied, thereby effectively direct-current A touch display device capable of reducing voltage distortion, a touch driving circuit, and a touch driving method may be provided.

In addition, according to embodiments of the present disclosure, DC voltage distortion is classified by reflecting the structure of the touch electrode, and a compensation voltage corresponding to a region where the DC voltage distortion occurs is applied, thereby effectively distorting the DC voltage. A touch display device capable of reducing the phenomenon, a touch driving circuit, and a touch driving method can be provided.

1 is a diagram schematically illustrating a touch display device according to embodiments of the present disclosure.
2 is an exemplary system diagram of a touch display device according to embodiments of the present disclosure.
3 is a diagram showing a structure in which a touch screen panel is embedded in a display panel in a touch display device according to embodiments of the present disclosure by way of example.
4 is a diagram schematically illustrating a structure of a touch electrode for touch sensing based on mutual capacitance in a touch display device according to embodiments of the present disclosure.
5 is a view illustrating a cross section of a touch display device according to embodiments of the present disclosure as an example.
6 is a diagram illustrating a display panel in which split-type touch electrodes are disposed in a touch display device according to embodiments of the present disclosure.
7 is a view illustrating a display panel on which woven-type touch electrodes are disposed in a touch display device according to embodiments of the present disclosure as an example.
8 is an exemplary view illustrating timing of a display driving period and a touch driving period in a touch display device according to embodiments of the present disclosure.
9 is an exemplary diagram illustrating LHB driving timing in a touch display device according to embodiments of the present disclosure.
10 is a diagram illustrating a portion of a touch electrode area in a touch display device according to embodiments of the present disclosure.
11 is a diagram conceptually illustrating an overlapping distortion phenomenon caused by overlapping a load deviation of a touch electrode and a scan signal during a display driving period in a touch display device according to embodiments of the present disclosure.
12 is a diagram illustrating types of DC voltage distortion occurring between a gate line and a touch electrode in a touch display device according to embodiments of the present disclosure, and FIG. 13 is a signal waveform diagram illustrating DC voltage distortion.
14 is a diagram illustrating an example of distinguishing between an overlapping distortion section and a transition distortion section in a touch display device according to embodiments of the present disclosure.
15 is a diagram illustrating a first transition distortion section in which the number of overlapping scan signals is large and a second transition distortion section in which the number of overlapping scan signals is small in transition distortion in a display device according to embodiments of the present disclosure as an example; .
16 is a diagram illustrating shapes of touch electrodes corresponding to positions of gate lines in a touch display device according to embodiments of the present disclosure as an example.
17 is a signal waveform illustrating an example of an overlap compensation voltage applied in a display driving period and a transition compensation voltage applied in a transition period in a touch display device according to embodiments of the present disclosure.
18 is a diagram illustrating examples of a first transition compensation voltage and a second transition compensation voltage applied to a transition distortion period in a touch display device according to embodiments of the present disclosure.
19 is a block diagram illustrating an example of a circuit generating a compensation voltage in a touch display device according to an embodiment of the present disclosure.
20 is a flowchart illustrating a touch driving method according to embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention are described in detail below with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted. When "comprises", "has", "consists of", etc. mentioned in this specification is used, other parts may be added unless "only" is used. In the case where a component is expressed in the singular, it may include the case of including the plural unless otherwise explicitly stated.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term.

In the description of the positional relationship of components, when it is described that two or more components are "connected", "coupled" or "connected", the two or more components are directly "connected", "coupled" or "connected". ", but it will be understood that two or more components and other components may be further "interposed" and "connected", "coupled" or "connected". Here, other components may be included in one or more of two or more components that are “connected”, “coupled” or “connected” to each other.

In the description of the temporal flow relationship related to components, operation methods, production methods, etc., for example, "after", "continued to", "after", "before", etc. Alternatively, when a flow sequence relationship is described, it may also include non-continuous cases unless “immediately” or “directly” is used.

On the other hand, when a numerical value or corresponding information (eg, level, etc.) for a component is mentioned, even if there is no separate explicit description, the numerical value or its corresponding information is not indicated by various factors (eg, process factors, internal or external shocks, noise, etc.) may be interpreted as including an error range that may occur.

1 is a diagram showing a schematic configuration of a touch display device according to embodiments of the present disclosure.

Referring to FIG. 1 , a touch display device 100 according to embodiments of the present disclosure includes a display panel 110, a gate driving circuit 120, a data driving circuit 130, a timing controller 140, and a display panel. It may include a touch driving circuit 150 that senses a touch to 110 and a power management circuit (Power Management IC, 160).

In the display panel 110, a plurality of gate lines GL and a plurality of data lines DL are disposed, and a plurality of subpixels SP are formed in an area where the gate lines GL and data lines DL intersect. are placed

Also, a plurality of touch electrodes may be disposed or incorporated in the display panel 110, and a plurality of touch lines TL electrically connecting the touch electrodes and the touch driving circuit 150 to each other may be disposed.

The configuration for driving the display in the display device 100 will be described first. The gate driving circuit 120 controls the driving timing of the subpixels SP disposed on the display panel 110 . Also, the data driving circuit 130 supplies data voltages corresponding to the image data to the subpixels SP. As a result, the sub-pixel SP displays an image by emitting light with a brightness corresponding to the gray level of the image data.

Specifically, the gate driving circuit 120 is controlled by the timing controller 140 and sequentially outputs scan signals to a plurality of gate lines GL disposed on the display panel 110 to generate a plurality of subpixels SP. Controls the driving timing of

The gate driving circuit 120 may include one or more gate driving integrated circuits (GDICs), and may be located on only one side of the display panel 110 or on both sides depending on the driving method. there is. Alternatively, the gate driving circuit 120 may be directly embedded in the bezel area of the display panel 110 and implemented in a GIP (Gate In Panel) form.

The data driving circuit 130 receives digital image data DATA from the timing controller 140 and converts the image data into an analog data voltage. In addition, the data voltage is output to each data line DL at the timing when the scan signal is applied through the gate line GL, so that each subpixel SP expresses brightness according to the data voltage.

The data driving circuit 130 may include one or more source driving integrated circuits (SDICs).

The timing controller 140 supplies various control signals to the gate driving circuit 120 and the data driving circuit 130 and controls operations of the gate driving circuit 120 and the data driving circuit 130 .

The timing controller 140 causes the gate driving circuit 120 to output a scan signal according to the timing implemented in each frame, and converts externally received image data according to the data signal format used by the data driving circuit 130. and outputs the converted image data DATA to the data driving circuit 130 .

The timing controller 140 receives various timing signals including a vertical synchronizing signal, a horizontal synchronizing signal, an input data enable signal, and a clock signal from the outside (eg, a host system) together with the image data DATA.

The timing controller 140 generates a data control signal DCS and a gate control signal GCS using various timing signals received from the outside and outputs them to the data driving circuit 130 and the gate driving circuit 120, respectively. can

For example, the timing controller 140 uses a gate start pulse, a gate shift clock, a gate output enable signal, and the like to control the gate driving circuit 120 . and outputs various gate control signals (GCS) including

Here, the gate start pulse controls the operation start timing of one or more gate driving integrated circuits constituting the gate driving circuit 120 . The gate shift clock is a clock signal commonly input to one or more gate driving integrated circuits and controls the shift timing of the scan signal. The gate output enable signal specifies timing information of one or more gate driving integrated circuits.

In addition, the timing controller 140 includes a source start pulse, a source sampling clock, a source output enable signal, and the like to control the data driving circuit 130. and outputs various data control signals (DCS).

Here, the source start pulse controls data sampling start timing of one or more source driving integrated circuits constituting the data driving circuit 130 . The source sampling clock is a clock signal that controls sampling timing of data in each source driving integrated circuit. The source output enable signal controls output timing of the data driving circuit 130 .

The touch display device 100 includes a touch driving circuit 150 that performs touch sensing and stylus sensing using signals received through the display panel 110 by driving the display panel 110 in which the touch screen panel is embedded. can do.

The touch driving circuit 150 includes a first circuit for applying a touch driving signal to the touch electrode constituting the display panel 110 and receiving the touch sensing signal through the sensing line SL, and the display panel 110. and a second circuit for detecting whether passive touch sensing (finger touch sensing) and active touch sensing are performed by using the touch sensing signal received through the touch sensor.

The first circuit may be referred to as a touch sensing circuit (ROIC; Read Out Integrated Circuit), and the second circuit may also be referred to as a touch controller.

The touch driving circuit 150 may sense the presence and location of a touch based on a capacitance deviation between touch electrodes formed on the display panel 110 . That is, a capacitance deviation occurs between a contacted position and a non-contacted position of the passive stylus or active stylus including the user's finger. It senses presence and location. The touch driving circuit 150 generates a touch sensing output signal for the presence and location of a touch and transfers it to an external microcontroller (not shown).

The microcontrol unit controls the touch driving circuit 150 . The microcontrol unit may receive a touch synchronization signal from a timing controller (not shown) and generate a touch driving signal for controlling the touch driving circuit 150 based on the received touch synchronization signal. The microcontrol unit exchanges a touch sensing detection signal and a touch driving signal based on an interface defined between the touch driving circuit 150 and the like.

Here, the microcontrol unit may be formed in the form of an integrated circuit together with the touch controller (TCR), or may be formed in the form of an integrated circuit together with the timing controller. If the micro control unit is made in the form of an integrated circuit together with the touch controller, the touch sensing circuit (ROIC) may be referred to as a touch driving circuit.

The touch display device 100 supplies various voltages or currents to the display panel 110, the gate driving circuit 120, the data driving circuit 130, and the touch driving circuit 150, or supplies various voltages or currents to be supplied. It may include a power management circuit 160 to control.

The power management circuit 160 adjusts the DC input voltage supplied from the host system to provide power required to drive the display panel 110, the gate driving circuit 120, the data driving circuit 130, and the touch driving circuit 150. occurs.

The data driving circuit 130 that applies the data voltage to the data line DL is also referred to as a source driving circuit or a source driving integrated circuit (SDIC), and the touch driving circuit 150 includes the data driving circuit 130 It may be implemented as an integrated drive circuit (SRIC) along with.

In this case, the integrated drive circuit SRIC may be a COF (Chip On Film) type mounted on a film, and may be embedded in the display panel 110 or mounted on a printed circuit board (PCB).

The film on which the integrated driving circuit (SRIC) is mounted may be coupled to the bonding portion of the display panel 110 and the bonding portion of the printed circuit board (PCB), respectively.

A touch controller or the like may be mounted on the printed circuit board (PCB).

The touch driving circuit 150 and the data driving circuit 130 may be implemented as separate driving chips. The touch driving circuit 150 may be electrically connected to a plurality of touch electrodes constituting the display panel 110 through a plurality of sensing lines.

In this case, the touch driving circuit 150 may perform touch sensing in a time-divided touch driving period separately from the display driving period, or the touch driving period for performing touch sensing may be performed concurrently with the display driving period.

Meanwhile, when the encapsulation layer is formed on the upper portion of the display panel 110 and the touch electrode is disposed on the upper portion, the capacitance capacity for driving the touch electrode may increase. For this reason, it is necessary to increase the level of the touch driving signal for driving the touch electrode. To this end, a level shifter (not shown) is added between the touch driving circuit 150 and the display panel 110 to generate the touch driving signal. You may also be able to control the level of

Each subpixel SP is defined by the intersection of the gate line GL and the data line DL, and liquid crystals or light emitting devices may be disposed depending on the type of the touch display device 100 .

For example, when the display device 100 is a liquid crystal display device, a light source device such as a backlight unit for radiating light to the display panel 110 is included, and liquid crystal is disposed in the subpixel SP of the display panel 110. do. In addition, by adjusting the arrangement of liquid crystals by an electric field formed as the data voltage is applied to each subpixel SP, it is possible to display an image with brightness according to the data voltage.

In the case of a liquid crystal display device, the display panel 110 includes a liquid crystal layer formed between two substrates, TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode, FFS (Fringe Field Switching) mode, etc. may be operated in any known mode. On the other hand, in the case of an organic light emitting display device, the display panel 110 may be implemented in a top emission method, a bottom emission method, or a dual emission method.

Meanwhile, the touch display device 100 according to embodiments of the present disclosure detects a user's touch on the display panel 110 using the touch electrodes and the touch driving circuit 150 included in the display panel 110. can

2 is an exemplary system diagram of a touch display device according to embodiments of the present disclosure.

Referring to FIG. 2 , a touch display device 100 according to embodiments of the present disclosure includes an integrated integrated circuit (SRIC) in which a data driving circuit 130 and a touch driving circuit 150 are combined and a gate driving integrated circuit (GDIC) ) is implemented in a COF (Chip On Film) method among various methods (TAB, COG, COF, etc.) as an example.

One or more gate driving integrated circuits GDIC may be mounted on the gate film GF, and one side of the gate film GF may be electrically connected to the display panel 110 . In addition, wires for electrically connecting the gate driving integrated circuit GDIC and the display panel 110 may be disposed on the gate film GF.

Similarly, one or more integrated driving circuits SRIC may be mounted on the source film SF, and one side of the source film SF may be electrically connected to the display panel 110 . In addition, wires for electrically connecting the integrated driving circuit SRIC and the display panel 110 may be disposed on the source film SF.

The display device 100 includes at least one source printed circuit board (SPCB), control components, and various electric devices for circuit connection between a plurality of integrated drive circuits (SRICs) and other devices. It may include a control printed circuit board (CPCB) for mounting them.

In this case, the other side of the source film SF on which the integrated driving circuit SRIC is mounted may be connected to at least one source printed circuit board SPCB. That is, the source film SF on which the integrated driving circuit SRIC is mounted may have one side electrically connected to the display panel 110 and the other side electrically connected to the source printed circuit board SPCB.

The timing controller 140 and the power management circuit (Power Management IC, 160) may be mounted on the control printed circuit board (CPCB). The timing controller 140 may control operations of the data driving circuit 130 , the gate driving circuit 120 , and the touch driving circuit 150 . The power management circuit 160 may supply driving voltage or current to the display panel 110, the data driving circuit 130, the gate driving circuit 120, and the touch driving circuit 150, or the supplied voltage or current. can control.

The at least one source printed circuit board (SPCB) and the control printed circuit board (CPCB) may be circuitically connected through at least one connecting member, for example, a flexible printed circuit (FPC). , a flexible flat cable (FFC), and the like. At this time, the connection member connecting at least one source printed circuit board (SPCB) and the control printed circuit board (CPCB) may be variously changed according to the size and type of the touch display device 100 . Also, at least one source printed circuit board (SPCB) and one control printed circuit board (CPCB) may be integrated into one printed circuit board.

In the case of the touch display device 100 configured as described above, the power management circuit 160 supplies a driving voltage required for driving the display or sensing a characteristic value through a flexible printed circuit (FPC) or a flexible flat cable (FFC). to the circuit board (SPCB). The driving voltage transferred to the source printed circuit board (SPCB) is supplied to emit or sense a specific subpixel (SP) in the display panel 110 through the source driving integrated circuit (SDIC).

At this time, each sub-pixel SP arranged on the display panel 110 in the display device 100 may be composed of an organic light emitting diode (OLED) as a light emitting device and a circuit element such as a driving transistor for driving the subpixel SP.

The type and number of circuit elements constituting each sub-pixel SP may be determined in various ways according to a provided function and a design method.

3 is a diagram showing a structure in which a touch screen panel is embedded in a display panel in a touch display device according to embodiments of the present disclosure by way of example.

Referring to FIG. 3 , in the touch display device 100 according to embodiments of the present disclosure, a plurality of subpixels SP are arranged on a substrate SUB in the display area AA of the display panel 110. .

Each subpixel (SP) has a light emitting element (ED), a first transistor (T1) for driving the light emitting element (ED), and a data voltage (Vdata) to a first node (N1) of the first transistor (T1). ) and a storage capacitor Cst to maintain a constant voltage for one frame.

The first transistor T1 includes a first node N1 to which the data voltage Vdata can be applied through the second transistor T2, a second node N2 electrically connected to the light emitting element ED, and It may include a third node N3 to which the driving voltage VDD is applied from the driving voltage line DVL. The first node N1 may be a gate node, the second node N2 may be a source node or a drain node, and the third node N3 may be a drain node or a source node. The first transistor T1 is referred to as a driving transistor for driving the light emitting element ED.

The light emitting device ED may include a first electrode (eg, an anode electrode), an emission layer, and a second electrode (eg, a cathode electrode). The first electrode may be electrically connected to the second node N2 of the first transistor T1, and the ground voltage VSS may be applied to the second electrode.

In the light emitting device ED, the light emitting layer may be an organic light emitting layer containing an organic material. In this case, the light emitting device ED may be an organic light emitting diode.

The on/off of the second transistor T2 is controlled by the scan signal SCAN applied through the gate line GL, and between the first node N1 of the first transistor T1 and the data line DL. can be electrically connected to The second transistor T2 may be referred to as a switching transistor.

When the second transistor T2 is turned on by the scan signal SCAN, the data voltage Vdata supplied through the data line DL is transferred to the first node N1 of the first transistor T1. .

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the first transistor T1.

Each subpixel SP may have a 2T1C structure including two transistors T1 and T2 and one capacitor Cst, and in some cases, one or more transistors may be further included or one or more capacitors may be included. may include more.

The storage capacitor Cst is not a parasitic capacitor that may exist between the first node N1 and the second node N2 of the first transistor T1, but an external intentionally designed outside the first transistor T1. It may be an external capacitor.

Each of the first transistor T1 and the second transistor T2 may be an n-type transistor or a p-type transistor.

Meanwhile, circuit elements such as a light emitting element ED, two or more transistors T1 and T2, and one or more capacitors Cst are disposed on the display panel 110 . Since these circuit elements are vulnerable to external moisture or oxygen, an encapsulation layer ENCAP may be disposed on the display panel 110 to prevent external moisture or oxygen from penetrating into the circuit elements.

In the touch display device 100 according to embodiments of the present disclosure, the touch screen panel TSP may be formed on the encapsulation layer ENCAP and embedded in the display panel 110 . That is, in the touch display device 100 , a plurality of touch electrodes TE constituting the touch screen panel TSP may be disposed on the encapsulation layer ENCAP to configure the display panel 110 .

The touch display device 100 is a capacitance-based touch sensing method, and may sense a touch using a mutual capacitance method or a self capacitance method.

In the case of a touch sensing method based on mutual capacitance, the plurality of touch electrodes TE is a touch driving electrode to which a touch driving signal is applied through a touch driving line, and a touch sensing signal is sensed through a touch sensing line. It can be classified as a touch sensing electrode that forms capacitance with the touch driving electrode. In this case, it may be referred to as a touch line including a touch driving line and a touch sensing line, and may be referred to as a touch signal including a touch driving signal and a touch sensing signal.

In the case of such a touch sensing method based on mutual capacitance, presence or absence of a touch and touch coordinates are detected based on a change in mutual capacitance occurring between a touch driving electrode and a touch sensing electrode according to the presence or absence of a pointer such as a finger or a pen.

In the case of the self capacitance-based touch sensing method, each touch electrode TE serves both as a touch driving electrode and as a touch sensing electrode. That is, a touch driving signal is applied to the touch electrode TE through one touch line, and a touch sensing signal transmitted from the touch electrode TE to which the touch driving signal is applied is received through the same touch line. Therefore, in the self-capacitance-based touch sensing method, there is no distinction between a touch driving electrode and a touch sensing electrode and a distinction between a touch driving line and a touch sensing line.

In the case of such a self-capacitance-based touch sensing method, the presence or absence of a touch and touch coordinates are detected based on a change in capacitance occurring between a pointer such as a finger or a pen and the touch electrode TE.

As such, the touch display device 100 may sense a touch using a mutual capacitance-based touch sensing method or may sense a touch using a self-capacitance-based touch sensing method.

4 is a diagram schematically illustrating a structure of a touch electrode for touch sensing based on mutual capacitance in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 4 , in the touch display device 100 according to embodiments of the present disclosure, the touch electrode structure for touch sensing based on mutual capacitance includes a plurality of X-touch electrode lines (X-TEL) and a plurality of Y - A touch electrode line (Y-TEL) may be included. Here, the plurality of X-touch electrode lines (X-TEL) and the plurality of Y-touch electrode lines (Y-TEL) are positioned on the upper portion of the encapsulation layer (ENCAP).

Each of the plurality of X-touch electrode lines X-TEL may be disposed in a first direction, and each of the plurality of Y-touch electrode lines Y-TEL may be disposed in a second direction different from the first direction.

In the present specification, the first direction and the second direction may be relatively different directions, and for example, the first direction may be an x-axis direction and the second direction may be a y-axis direction. Conversely, the first direction may be the y-axis direction and the second direction may be the x-axis direction. Also, the first direction and the second direction may be orthogonal to each other, but may not be orthogonal to each other. Also, in this specification, rows and columns are relative, and the rows and columns may change depending on the viewing point.

Each of the plurality of X-touch electrode lines X-TEL may be composed of several X-touch electrodes electrically connected to each other. Each of the plurality of Y-touch electrode lines Y-TEL may be composed of several Y-touch electrodes electrically connected to each other.

Here, the plurality of X-touch electrodes and the plurality of Y-touch electrodes are electrodes that are included in the plurality of touch electrodes TE and have distinct roles (functions).

For example, the plurality of X-touch electrodes constituting each of the plurality of X-touch electrode lines (X-TEL) are touch driving electrodes, and the plurality of Y-touch electrodes constituting each of the plurality of Y-touch electrode lines (Y-TEL) The touch electrode may be a touch sensing electrode. In this case, each of the plurality of X-touch electrode lines X-TEL corresponds to a touch driving electrode line, and each of the plurality of Y-touch electrode lines Y-TEL corresponds to a touch sensing electrode line.

Conversely, the plurality of X-touch electrodes constituting each of the plurality of X-touch electrode lines (X-TEL) are touch sensing electrodes, and the plurality of Y-touch electrodes constituting each of the plurality of Y-touch electrode lines (Y-TEL). -The touch electrode may be a touch driving electrode. In this case, each of the plurality of X-touch electrode lines X-TEL corresponds to a touch sensing electrode line, and each of the plurality of Y-touch electrode lines Y-TEL corresponds to a touch driving electrode line.

The touch sensor metal for touch sensing may include a plurality of touch lines TL in addition to a plurality of X-touch electrode lines X-TEL and a plurality of Y-touch electrode lines Y-TEL.

The plurality of touch lines TL include one or more X-touch lines X-TL connected to each of the plurality of X-touch electrode lines X-TEL and a plurality of Y-touch electrode lines Y-TEL respectively. It may include one or more Y-touch lines (Y-TL) connected to .

5 is a view illustrating a cross section of a touch display device according to embodiments of the present disclosure as an example.

However, here, the Y-touch electrode Y-TE is shown in a plate shape, which is only an example, and may be a mesh type.

Referring to FIG. 5 , in the touch display device 100 according to embodiments of the present disclosure, a first transistor T1 serving as a driving transistor is disposed on a substrate SUB in a subpixel SP located in the display area AA. can be placed in

The first transistor T1 may include a gate electrode GE, a source electrode SE or drain electrode DE, and a semiconductor layer SEMI. In this case, the source electrode SE and the drain electrode DE may be made of the same material as the first node electrode NE1 and the second node electrode NE2 positioned in the bending region BD.

The gate electrode GE and the semiconductor layer SEMI may overlap with the gate insulating layer GI interposed therebetween. The source electrode SE is formed on the insulating layer INS and contacts one side of the semiconductor layer SEMI, and the drain electrode DE is formed on the insulating layer INS and contacts the other side of the semiconductor layer SEMI. can come into contact with

The light emitting element ED includes a first electrode E1 corresponding to an anode electrode (or cathode electrode), a light emitting layer EL formed on the first electrode E1, and a cathode electrode (or cathode electrode) formed on the light emitting layer EL. a second electrode E2 corresponding to the anode electrode) and the like.

The first electrode E1 is electrically connected to the source electrode SE of the first transistor T1 exposed through a contact hole penetrating the planarization layer PLN.

The light emitting layer EL is formed on the first electrode E1 of the light emitting region provided by the bank BANK. The light emitting layer EL may be formed by stacking the hole related layer, the light emitting layer, and the electron related layer in the order or reverse order on the first electrode E1. The second electrode E2 may be formed to face the first electrode E1 with the light emitting layer EL interposed therebetween.

The encapsulation layer ENCAP blocks penetration of external moisture or oxygen into the light emitting element ED, which is vulnerable to external moisture or oxygen. This encapsulation layer (ENCAP) may be made of one layer, but may also be made of a plurality of laminated structures (PAS1, PCL, PAS2).

For example, when the encapsulation layer ENCAP is formed of a plurality of laminated structures PAS1, PCL, and PAS2, the encapsulation layer ENCAP includes one or more inorganic encapsulation layers PAS1 and PAS2 and one or more organic encapsulation layers PCL. can include As a specific example, in the encapsulation layer ENCAP, a first inorganic encapsulation layer PAS1, an organic encapsulation layer PCL, and a second inorganic encapsulation layer PAS2 may be sequentially stacked.

Here, the organic encapsulation layer PCL may further include at least one organic encapsulation layer or at least one inorganic encapsulation layer.

The first inorganic encapsulation layer PAS1 is formed on the substrate SUB on which the second electrode E2 corresponding to the cathode electrode is formed most adjacent to the light emitting element ED. The first inorganic encapsulation layer PAS1 is formed of, for example, an inorganic insulating material capable of low-temperature deposition such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). Since the first inorganic encapsulation layer PAS1 is deposited in a low-temperature atmosphere, the first inorganic encapsulation layer PAS1 can prevent the light emitting layer EL including an organic material vulnerable to a high-temperature atmosphere from being damaged during the deposition process. can

The organic encapsulation layer PCL may have an area smaller than that of the first inorganic encapsulation layer PAS1. In this case, the organic encapsulation layer PCL is formed to expose both ends of the first inorganic encapsulation layer PAS1. It can be. The organic encapsulation layer (PCL) may serve as a buffer to relieve stress between the respective layers according to bending of the touch display device, which is an organic light emitting display device, and may serve to enhance planarization performance. The organic encapsulation layer PCL may be formed of, for example, an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC).

On the other hand, when the organic encapsulation layer (PCL) is formed through the inkjet method, one or more dams (DAM) in a dam area corresponding to a boundary area between the non-display area and the display area AA or a partial area within the non-display area ) can be formed.

For example, the dam area is located between the display area AA and the pad area where a plurality of touch pads are formed in the non-display area, and in this dam area, the first dam DAM1 adjacent to the display area AA and the pad area A secondary dam (DAM2) adjacent to may exist.

In the one or more dams DAM disposed in the dam area, when the organic encapsulation layer PCL in liquid form is loaded on the display area AA, the organic encapsulation layer PCL in liquid form collapses in the direction of the non-display area, thereby forming a pad. You can prevent encroaching on your territory.

The primary dam DAM1 or the secondary dam DAM2 may have a single-layer or multi-layer structure. For example, the primary dam DAM1 or the secondary dam DAM2 may be simultaneously formed of the same material as at least one of the bank and the spacer (not shown). In this case, the dam structure can be formed without an additional mask process and cost increase.

Also, the primary dam DAM1 or the secondary dam DAM2 may have a structure in which a first inorganic encapsulation layer PAS1 and a second inorganic encapsulation layer PAS2 are stacked on the bank BANK. At this time, the organic encapsulation layer (PCL) containing organic material may be located on the inner side of the primary dam (DAM1) or located on top of at least a part of the primary dam (DAM1) and the secondary dam (DAM2). .

The second inorganic encapsulation layer PAS2 may be formed on the substrate SUB on which the organic encapsulation layer PCL is formed to cover the top and side surfaces of the organic encapsulation layer PCL and the first inorganic encapsulation layer PAS1, respectively. there is. The second inorganic encapsulation layer PAS2 minimizes or blocks penetration of external moisture or oxygen into the first inorganic encapsulation layer PAS1 and the organic encapsulation layer PCL. The second inorganic encapsulation layer PAS2 is formed of, for example, an inorganic insulating material such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3).

A touch buffer layer T-BUF may be disposed on the encapsulation layer ENCAP. The touch buffer layer T-BUF includes a touch sensor metal including touch electrodes X-TE and Y-TE and touch electrode connection lines X-CL and Y-CL, and a second electrode of the light emitting element ED. (E2) may be located between.

The touch buffer layer T-BUF may be designed such that a distance between the touch sensor metal and the second electrode E2 of the light emitting element ED maintains a predetermined minimum distance (eg, 1 μm). Accordingly, the parasitic capacitance formed between the touch sensor metal and the second electrode E2 of the light emitting element ED can be reduced or prevented, and through this, a decrease in touch sensitivity due to the parasitic capacitance can be prevented.

On the other hand, without such a touch buffer layer (T-BUF), a touch sensor including touch electrodes (X-TE, Y-TE) and touch electrode connection lines (X-CL, Y-CL) on the encapsulation layer (ENCAP) Metal may also be disposed.

In addition, the touch buffer layer (T-BUF) is a light emitting layer containing an organic substance such as a chemical solution (developer or etching solution, etc.) used in the manufacturing process of the touch sensor metal disposed on the touch buffer layer (T-BUF) or moisture from the outside. (EL) can block penetration. Accordingly, the touch buffer layer T-BUF may prevent damage to the light emitting layer EL, which is vulnerable to chemicals or moisture.

The touch buffer layer (T-BUF) can be formed at a low temperature below a certain temperature (eg, 100 ° C.) and is formed of an organic insulating material having a low dielectric constant in order to prevent damage to the light emitting layer (EL) containing an organic material vulnerable to high temperatures. can For example, the touch buffer layer T-BUF may be formed of an acryl-based, epoxy-based, or siloxan-based material. The touch buffer layer (T-BUF), which is made of an organic insulating material and has a flattening performance, causes damage to the inner layers (PAS1, PCL, PAS2) constituting the encapsulation layer (ENCAP) due to bending of the organic light emitting display device and the touch buffer layer (T-BUF). ), it is possible to prevent the cracking of the touch sensor metal formed on the surface.

In the case of a touch sensing structure based on mutual capacitance, an X-touch electrode line (X-TEL) and a Y-touch electrode line (Y-TEL) are disposed on the touch buffer layer (T-BUF), and the X-touch electrode line ( X-TEL) and Y-touch electrode line (Y-TEL) may be disposed to cross each other. The Y-touch electrode line Y-TEL may include a plurality of Y-touch electrode connection lines Y-CL electrically connecting the plurality of Y-touch electrodes Y-TE.

In this case, the plurality of Y-touch electrodes Y-TE and the plurality of Y-touch electrode connection lines Y-CL may be positioned on different layers with the interlayer dielectric ILD interposed therebetween.

The plurality of Y-touch electrodes Y-TE may be spaced apart at regular intervals along the y-axis direction. The plurality of Y-touch electrodes Y-TE may be electrically connected to other Y-touch electrodes Y-TE adjacent in the y-axis direction through the Y-touch electrode connection line Y-CL.

The Y-touch electrode connection line (Y-CL) is formed on the touch buffer layer (T-BUF) and is exposed through a touch contact hole penetrating the interlayer dielectric (ILD) to form two adjacent Y-touch electrodes in the y-axis direction ( Y-TE) and electrically connected.

The Y-touch electrode connection line Y-CL may be disposed to overlap the bank BANK. Accordingly, it is possible to prevent an aperture ratio from being lowered due to the Y-touch electrode connection line (Y-CL).

The X-touch electrode line X-TEL may include a plurality of X-touch electrode connection lines X-CL electrically connecting the plurality of X-touch electrodes X-TE. The plurality of X-touch electrodes X-TE and the plurality of X-touch electrode connection lines X-CL may be positioned on different layers with the interlayer dielectric ILD interposed therebetween.

The plurality of X-touch electrodes X-TE may be spaced apart at regular intervals along the x-axis direction on the interlayer dielectric ILD. The plurality of X-touch electrodes X-TE may be electrically connected to other X-touch electrodes X-TE adjacent in the x-axis direction through an X-touch electrode connection line X-CL.

The X-touch electrode connection line (X-CL) is disposed on the same plane as the X-touch electrode (X-TE) and connects two adjacent X-touch electrodes (X-TE) in the x-axis direction without a separate contact hole. It may be electrically connected or integral with two X-touch electrodes (X-TE) adjacent in the x-axis direction.

The X-touch electrode connection line X-CL may be disposed to overlap the bank BANK. Accordingly, it is possible to prevent an aperture ratio from being lowered due to the X-touch electrode connection line (X-CL).

Meanwhile, the Y-touch electrode line Y-TEL may be electrically connected to the touch driving circuit 150 through the Y-touch line Y-TL and the Y-touch pad Y-TP. Similarly, the X-touch electrode line X-TEL may be electrically connected to the touch driving circuit 150 through the X-touch line X-TL and an X-touch pad (not shown).

In this case, pad cover electrodes covering the X-touch pad and the Y-touch pad (Y-TP) may be further disposed.

The X-touch pad may be formed separately from the X-touch line (X-TL) or may be formed by extending the X-touch line (X-TL). The Y-touch pad Y-TP may be formed separately from the Y-touch line Y-TL, or may be formed by extending the Y-touch line Y-TL.

When the X-touch pad is formed to extend from the X-touch line (X-TL) and the Y-touch pad (Y-TP) is formed to extend from the Y-touch line (Y-TL), the X-touch pad , the X-touch line (X-TL), the Y-touch pad (Y-TP), and the Y-touch line (Y-TL) may be made of the same first conductive material. Here, the first conductive material may be formed in a single-layer or multi-layer structure using, for example, a metal having strong corrosion resistance and acid resistance and good conductivity, such as Al, Ti, Cu, and Mo.

For example, the X-touch pad, X-touch line (X-TL), Y-touch pad (Y-TP) and Y-touch line (Y-TL) made of the first conductive material are Ti/Al/Ti Alternatively, it may be formed in a stacked three-layer structure such as Mo/Al/Mo.

The pad cover electrode capable of covering the X-touch pad and the Y-touch pad (Y-TP) may be made of a second conductive material made of the same material as the first and Y-touch electrodes (X-TE and Y-TE). there is. Here, the second conductive material may be formed of a transparent conductive material such as ITO or IZO having strong corrosion resistance and acid resistance. The pad cover electrode may be formed to be exposed by the touch buffer layer T-BUF and thus bonded to the touch driving circuit 150 or bonded to a circuit film on which the touch driving circuit 150 is mounted.

Here, the touch buffer layer T-BUF is formed to cover the touch sensor metal to prevent the touch sensor metal from being corroded by external moisture or the like. For example, the touch buffer layer T-BUF may be formed of an organic insulating material, or may be formed in the form of a circular polarizing plate or a film made of epoxy or acrylic. The touch buffer layer T-BUF may not be on the encapsulation layer ENCAP. That is, the touch buffer layer T-BUF may not be an essential component.

The Y-touch line Y-TL may be electrically connected to the Y-touch electrode Y-TE through a touch line contact hole or integrally formed with the Y-touch electrode Y-TE.

The Y-touch line (Y-TL) extends to the non-display area and passes through the upper and side surfaces of the encapsulation layer (ENCAP) and the upper and side surfaces of the dam (DAM) to be electrically connected to the Y-touch pad (Y-TP). can Accordingly, the Y-touch line Y-TL may be electrically connected to the touch driving circuit 150 through the Y-touch pad Y-TP.

The Y-touch line Y-TL transfers a touch sensing signal from the Y-touch electrode Y-TE to the touch driving circuit 150 or receives a touch driving signal from the touch driving circuit 150 and receives a touch driving signal from the Y-touch electrode Y-TE. It can be transmitted to the touch electrode (Y-TE).

In this case, a Y-touch bridge wire (Y-BL) connected through a contact hole (CH) may be disposed below the Y-touch line (Y-TL) in the notch area (NT) and the bending area (BD). there is. Since the Y-touch line (Y-TL) and the Y-touch bridge wire (Y-BL) are electrically connected through at least one contact hole (CH) formed at regular intervals, the same touch driving signal or touch sensing signal is applied. can be conveyed

As such, when the Y-touch line Y-TL and the Y-touch bridge wire Y-BL are electrically connected, electrical resistance may be reduced during transmission of a touch driving signal or a touch sensing signal. In addition, when the Y-touch line (Y-TL) and the Y-touch bridge wiring (Y-BL) are connected through a plurality of contact holes (CH), the Y-touch line (Y-TL) or Y-touch line (Y-TL) is used in some sections. - Even if a disconnection occurs in the touch bridge wiring (Y-BL), the touch signal (touch driving signal or touch sensing signal) can be detoured through the contact hole (CH), so that touch sensing performance can be maintained.

A region other than the contact hole CH may be insulated from the Y-touch line Y-TL and the Y-touch bridge wire Y-BL by the interlayer dielectric ILD disposed therebetween.

Meanwhile, a plurality of Y-touch lines (Y-TL1, Y-TL2, Y-TL3, and Y-TL4) may be disposed in the bezel area BZ, and a Y-touch bridge electrode (Y -BE) can be placed.

The Y-touch bridge electrodes (Y-BE) have an integral structure to cover the area occupied by the upper Y-touch lines (Y-TL1, Y-TL2, Y-TL3, Y-TL4). The touch lines Y-TL1 , Y-TL2 , Y-TL3 , and Y-TL4 may be formed to have the same or wider width.

At this time, the Y-touch bridge electrode (Y-BE) is connected to the ground voltage (GND) to discharge noise charges flowing into the display panel 110, and the Y-touch bridge located in the bending area (BD) It is separated from the wiring Y-BL or the second node electrode NE2.

As a result, the display panel ( Noise charges flowing into 110 are easily discharged to the ground voltage (GND), thereby improving touch sensing performance of the touch display device 100 and reducing defects caused by display driving.

Meanwhile, the X-touch line (X-TL) may be electrically connected to the X-touch electrode (X-TE) through a touch line contact hole or integrally with the X-touch electrode (X-TE).

The X-touch line X-TL extends to the non-display area and passes through the upper and side surfaces of the encapsulation layer ENCAP and the upper and side surfaces of the dam DAM to be electrically connected to the X-touch pad Y-TP. can Accordingly, the X-touch line X-TL may be electrically connected to the touch driving circuit 150 through the X-touch pad.

The X-touch line (X-TL) may receive a touch driving signal from the touch driving circuit 150 and transmit it to the X-touch electrode (X-TE), and touch sensing in the X-touch electrode (X-TE) A signal may be transmitted to the touch driving circuit 150 .

The arrangement of the X-touch line (X-TL) and the Y-touch line (Y-TL) may be variously changed according to the design of the display panel 110 .

Meanwhile, a touch protection layer PAC may be disposed on the X-touch electrode X-TE and the Y-touch electrode Y-TE. The touch protection layer PAC may extend to the front or rear portion of the dam DAM and may also be disposed on the X-touch line X-TL and the Y-touch line Y-TL.

Meanwhile, the cross-sectional view shown here conceptually shows the structure of the touch display device 100, and the position, thickness, or width of each pattern (various layers or various electrodes) may vary depending on the viewing direction or location. And, the connection structure of various patterns may be changed, additional layers may be present in addition to the illustrated layers, and some of the illustrated layers may be omitted or integrated. For example, the width of the bank BANK may be narrower than in the drawing, and the height of the dam DAM may be lower or higher than in the drawing.

The touch display device 100 may be used for mobile devices such as smart phones and tablet PCs, and may be used for large-screen display devices such as automobile displays and exhibition displays.

In addition, such a touch display device 100 includes a liquid crystal display device, an organic light emitting display device, a plasma display panel, a quantum dot display, and the like. may be various types of devices.

For example, when the touch display device 100 according to embodiments of the present disclosure is a liquid crystal display device, a plurality of touch electrodes TE are disposed on the display panel 110 and a common voltage of a DC level is used to drive the display. may be common electrodes applied.

As another example, when the touch display device 100 according to embodiments of the present disclosure is an organic light emitting display device, the first electrode (anode electrode) constituting the organic light emitting diode, the organic light emitting layer, and the second It may include an electrode (cathode electrode), an encapsulation layer positioned thereon and having a sealing function, and a touch sensor metal layer positioned thereon. In this case, the plurality of touch electrodes TE may be formed on the touch sensor metal layer or may be formed on the second electrode layer constituting the cathode electrode of the organic light emitting diode.

Meanwhile, the DC voltage applied to the touch electrode TE may be applied at a specific voltage level within the display driving period.

At this time, the display panel 110 is a split type in which each of the plurality of touch electrodes TE is separated from each other, or a woven type in which touch electrodes TE of different sizes are disposed in adjacent rows (or columns). (Woven type).

6 is a diagram illustrating a display panel in which split-type touch electrodes are disposed in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 6 , in the case of a display panel 110 having split-type touch electrodes TE having the same shape in the touch display device 100 according to embodiments of the present disclosure, a plurality of touch electrodes TE ) may be electrically connected to a touch line TL through which a touch driving signal or a touch sensing signal is transmitted through one or more contact holes CNT.

A plurality of touch electrodes TE may be positioned within the display area of the display panel 110 . In some cases, some (eg, outermost touch electrodes) of the plurality of touch electrodes TE may be positioned outside the display area (outer area) or may extend to the outer area (outer area) of the display area. Here, the display area may be an area where an image is displayed or an area where touch sensing is possible.

In this case, the plurality of touch lines TL electrically connected to the plurality of touch electrodes TE may be positioned within the display area. In some cases, all or part of the touch line TL may be located outside the display area. When the plurality of touch lines TL electrically connected to the plurality of touch electrodes TE are located in the display area, the plurality of touch lines TL are located on a different layer from the plurality of touch electrodes TE, It may overlap with a plurality of touch electrodes TE.

All of the plurality of touch lines TL may have the same or similar length and may be disposed from a point connected to the touch driving circuit 150 to an opposite point. Each of the plurality of touch lines TL may be different only in a position electrically connected to a corresponding touch electrode TE (ie, a position of a contact hole CNT).

In the case of the split-type display panel 110, if one touch electrode TE is electrically connected to one touch line TL, the number of touch lines TL is as necessary as the number of touch electrodes TE. It will be. Here, the number of touch lines TL corresponds to the number of touch channels for signal input/output of the touch driving circuit 150 .

Accordingly, in the case of a split type composed of 4X4 touch electrodes TE, since 16 touch lines TL connected to 16 touch electrodes TE are disposed, at least 16 touch channels are required.

The touch display device 100 of the present invention is not only a split type in which each of the plurality of touch electrodes TE is separated from each other, but also a woven type in which touch electrodes TE of different sizes are disposed in adjacent rows or columns. structure can be made.

7 is a view illustrating a display panel on which woven-type touch electrodes are disposed in a touch display device according to embodiments of the present disclosure as an example.

Referring to FIG. 7 , in the touch display device 100 according to embodiments of the present disclosure, the woven-type display panel 110 includes four long-type touch electrodes TE1_L to TE4_L and four short-type touches connected in the same line. The electrodes TE1_S to TE4_S may be configured as one touch electrode group TEG.

In other words, the long touch electrodes TE1_L, TE2_L, TE3_L, and TE4_L having a length in the row direction include four short touch electrodes TE(1)1_S, TE(1)2_S, TE(1)3_S, and TE(1) 4_S), in this case, four short touch electrodes in the column direction (eg, TE(1)1_S, TE(2)1_S, TE(3)1_S, TE(4)1_S) It can be connected to this one short touch line (eg, TL1_S). Therefore, four short-type touch electrodes arranged in a column direction constitute one short-type touch electrode block connected in one same line, and the four long-type touch electrodes and four short-type touch electrode blocks connected in the same line corresponding thereto constitute one short-type touch electrode block. One touch electrode group TEG may be formed.

In the case of a weave-type 4X4 touch electrode structure, among two adjacent rows, the number of touch electrodes in the row in which the short touch electrodes are disposed corresponds to 1/4 of the number of touch electrodes in the row in which the long-shaped touch electrodes are disposed. Accordingly, the lengths of the long-type touch electrodes TE1_L, TE2_L, TE3_L, and TE4_L are about four times the lengths of the short-type touch electrodes TE1_S to TE4_S.

In this case, the woven-type 4X4 touch electrode structure includes four long touch electrodes TE1_L, TE2_L, TE3_L, and TE4_L and 16 short touch electrodes TE(1)1_S, TE(1)2_S, TE(1)3_S, TE(1)4_S to TE(4)1_S, TE(4)2_S, TE(4)3_S, TE(4)4_S), but four short touch electrodes in the column direction (eg, TE(1) )1_S, TE(2)1_S, TE(3)1_S, TE(4)1_S) are connected to one short touch line (eg, TL1_S).

Therefore, four short touch electrodes (eg, TE(1)1_S, TE(2)1_S, TE(3)1_S, TE(4)1_S) connected to a short touch line (eg, TL1_S) are Since one short-type touch electrode block connected by the same line is formed, 16 short-type touch electrodes (TE(1)1_S, TE(1)2_S, TE(1)3_S, TE(1)4_S to TE(4)1_S , TE(4)2_S, TE(4)3_S, and TE(4)4_S) constitute four short-type touch electrode blocks connected in the same line.

As a result, one long touch line TL1_L, TL2_L, TL3_L, TL4_L is connected to each of the four long touch electrodes TE1_L, TE2_L, TE3_L, and TE4_L, and the four short touch electrode blocks connected in the same line have a short touch Since the lines (TL1_S, TL2_S, TL3_S, TL4_S) are connected one by one, 8 touch lines (TL1_L, TL2_L, TL3_L, TL4L, TL1_S, TL2_S, TL3_S, TL4_S) and 8 touches in the case of a 4X4 touch electrode structure of the weaving type channel is needed.

Therefore, compared to the split-type touch electrode structure, the woven-type touch electrode structure has an effect of reducing the number of touch lines and touch channels.

Meanwhile, although the size of the touch electrode group TEG may be variously changed, multi-touch detection is performed in order to efficiently arrange the touch electrodes TE on the display panel 110 and increase the accuracy of multi-touch detection. The size of the touch electrode group TEG may be determined in consideration of a distance between a finger or a stylus to perform the touch electrode group.

Meanwhile, a plurality of touch electrode groups (TEGs) of this weaving type may be disposed in the horizontal and vertical directions within the display panel 110. In this case, each touch electrode group (TEG) displays an image on the display panel 110. are electrically separated in the display area, but can be connected to the touch driving circuit 150 through the touch line TL in the non-display area where no image is displayed.

8 is an exemplary view illustrating timing of a display driving period and a touch driving period in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 8 , the touch display device 100 according to embodiments of the present disclosure performs display driving for displaying an image during a display driving period (DP) determined within one display frame period (Display Frame), Touch driving for sensing a touch input by a finger or a stylus may be performed during a predetermined touch driving period TP.

In the touch display device 100, electrodes for driving each pixel may be used as electrodes for sensing touch. Therefore, DC voltage is supplied to the thin film transistor connected to the touch electrode during the display driving period DP, and a touch driving signal in the form of a pulse is supplied to the touch electrode during the touch driving period TP.

The display driving period DP and the touch driving period TP may be temporally identical or overlapping periods, or may be temporally separated periods.

A case in which the display driving period DP and the touch driving period TP are temporally separated may be referred to as time division driving.

On the other hand, when the display driving period (DP) and the touch driving period (TP) are temporally identical, display driving and touch driving may be performed simultaneously, and this driving method may be referred to as time free driving.

In the case of time division driving, the display driving period DP and the touch driving period TP may alternately proceed.

As such, when the display driving period DP and the touch driving period TP are alternately separated in time, the touch driving period TP may correspond to a blank period in which display driving is not performed.

Meanwhile, the touch display device 100 generates a touch synchronization signal Tsync that swings between a high level and a low level, and through this, the display driving period DP and the touch driving period TP can be identified or controlled. That is, the touch synchronization signal Tsync may be a timing control signal defining the touch driving period TP.

For example, the high level period (or low level period) of the touch synchronization signal Tsync may correspond to the display driving period DP, and the low level period (or high level period) of the touch synchronization signal Tsync It may correspond to the touch driving period TP.

In this case, the touch driving circuit 150 applies the touch driving signal to the touch electrode TE during the touch driving period TP when the touch synchronization signal Tsync is at a low level, and performs touch sensing received from the touch electrode TE. The presence or absence of a touch of the passive stylus or the active stylus and the touch position may be sensed using the signal.

Meanwhile, in relation to a method of allocating the display driving period (DP) and the touch driving period (TP) within one display frame period (Display Frame), one display frame period (Display Frame) is divided into one display driving period ( DP) and one touch driving period (TP), display driving is performed during one display driving period (DP), and the passive stylus and Touch driving for sensing a touch input by the active stylus may proceed.

That is, the touch display device 100 may be driven for touch once during a screen refresh rate of the display panel 110 or a display frame period that is one cycle of the frame frequency.

For example, when the frame frequency is 60 Hz, a display drive is performed to turn on or turn off pixels through N gate lines constituting the display panel 110 within a period of 1/60 s, and then at regular intervals. During this time, a touch driving period TP for touch sensing proceeds. In this case, the touch report rate will be 60 Hz.

As another example, one display frame period (Display Frame) is divided into two or more display driving periods (DP) and two or more touch driving periods (TP), and two or more display driving periods are divided into one display frame period (Display Frame). (DP), the display drive may proceed, and during two or more touch drive periods (TP), touch drive to sense touch inputs by the passive stylus and the active stylus may be performed one or more times in the entire area or some areas of the screen. there is.

As such, when display driving and touch driving are performed by dividing one display frame period (Display Frame) into two or more display driving periods (DP) and two or more touch driving periods (TP), one display frame period ( Each of two or more blank periods (Blanks) corresponding to two or more touch driving periods (TP) within the Display Frame is referred to as a long horizontal blank (LHB).

Therefore, two or more periods in which touch sensing for a stylus or finger is performed within a display frame period may be referred to as an LHB or a touch driving period (TP), and two or more LHB periods within one display frame period (Display Frame) Touch driving performed during this process may be referred to as “driving”.

9 is an exemplary diagram illustrating LHB driving timing in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 9 , in the touch display device 100 according to embodiments of the present disclosure, one display frame period includes 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 ~ TP16).

In this case, the 16 touch driving periods TP1 to TP16 may correspond to 16 LHBs (LHB1 to LHB16).

At this time, the touch display device 100 divides one display frame period into one or more display driving periods (DP1 to DP16) and one or more touch driving periods (TP1 to TP16) to perform display driving and touch driving. You can proceed alternately.

Alternatively, the touch driving periods TP1 to TP16 may proceed independently of the display driving periods DP1 to DP16.

10 is a diagram illustrating a portion of a touch electrode area in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 10 , a touch display device 100 according to embodiments of the present disclosure includes a thin film transistor (TFT) formed on a substrate and a subpixel electrode (SP11-) connected to a drain node or a source node of the thin film transistor. SP44) and a touch electrode TE formed to overlap the subpixel electrode to form an electric field.

A gate node of the thin film transistor TFT is connected to a gate line so that on/off is controlled according to a scan signal, and a source node or a drain node is connected to a data line DL to which a data voltage is supplied.

At this time, when a passive stylus or an active stylus such as a finger touches the display panel 110, the touch display device 100 detects the touch position by recognizing a change in capacitance of the touch electrode TE close to the contact position of the stylus. can do. That is, after applying a touch driving signal to the touch electrodes TE formed on the display panel 110, a touch sensing signal received from the touch electrodes TE is detected to detect a capacitance change of each of the touch electrodes TE. By doing so, the touch position can be detected.

At this time, a DC voltage or a touch signal is applied to the touch electrodes TE of the touch display device 100, and parasitic capacitance coupled with the touch electrodes TE may occur. For example, parasitic capacitance may occur between the gate line and the touch electrode TE due to a scan signal applied to the display panel 110 through a gate line. Due to this parasitic capacitance, a load is applied to the touch electrode TE. As R increases, distortion occurs in the DC voltage supplied to the touch electrode TE, and a defective line may appear on the display panel 110 .

11 is a diagram conceptually illustrating an overlapping distortion phenomenon caused by overlapping a load deviation of a touch electrode and a scan signal during a display driving period in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 11 , in the touch display device 100 according to embodiments of the present disclosure, the scan signal SCAN supplied to the display panel 110 through the gate line is sequentially transmitted at intervals of one horizontal period (1H). can be supplied with

At this time, the scan signal (SCAN) can maintain a high level for a certain period. Here, the case of having a high level period of 5 horizontal periods (5H) is shown as an example.

As such, when the scan signal SCAN supplied to the display panel 110 through the gate line GL has a constant high level period and is supplied at intervals of one horizontal period (1H), adjacent scan signals (SCAN) ), an overlapping section occurs between them. Parasitic capacitance Cgc may occur between the gate line GL and the touch electrode TE due to the overlapping period of the scan signal SCAN.

In other words, the parasitic capacitance Cgc is accumulated between the gate node of the thin film transistor TFT and the touch electrode TE to which the DC voltage Vcom is applied, and the load on the touch electrode TE increases to increase the DC voltage ( Vcom) may be distorted.

The distortion of the DC voltage Vcom may vary depending on the shape of the touch electrode TE to which the touch signal is supplied.

The size of the touch electrode TE disposed on the display panel 110 may correspond to the area size of one subpixel or may correspond to the area size of two or more subpixels. In addition, each touch electrode TE may be a plate type without an opening or a mesh type with one or more openings.

If one touch electrode TE is a mesh type and has a size corresponding to the area size of two or more subpixels, one touch electrode TE has two or more openings, and the positions and sizes of each of the two or more openings may correspond to the position and size of the light emitting region of the subpixel.

12 is a diagram illustrating types of DC voltage distortion occurring between a gate line and a touch electrode in a touch display device according to embodiments of the present disclosure, and FIG. 13 is a signal waveform diagram illustrating DC voltage distortion.

Referring to FIGS. 121 and 13 , the touch display device 100 according to embodiments of the present disclosure performs display driving for displaying an image during a display driving period (DP) determined within one display frame period (Display Frame). and perform touch driving for sensing a touch input by a finger or a stylus during a predetermined touch driving period (TP).

In this case, the touch electrode TE for touch sensing may be used as an electrode for driving each pixel. Therefore, DC voltage is supplied to the touch electrodes during the display driving period DP, and a touch driving signal in a pulse form is supplied to the touch electrodes during the touch driving period TP.

At this time, the operation of the gate driving circuit 120 temporarily stops in the process of entering the touch driving period TP from the display driving period DP, and after the touch driving period TP ends, the display driving period DP ) starts, the operation of the gate driving circuit 120 starts again.

As such, when the scan signals overlap in a section where the gate driving circuit 120 operates discontinuously, distortion of the direct current voltage Vcom occurs in some gate lines, and thus, a difference in luminance occurs, resulting in horizontal lines and the like. defects may occur. Here, due to overlapping of the first scan signal SCAN1 and the second scan signal SCAN2, distortion of the DC voltage Vcom occurs in the process of entering the touch drive period TP from the display drive period DP. A case is shown as an example.

In this way, a defect occurring during a transition process between the display driving period DP and the touch driving period TP may be referred to as transition distortion.

In addition, scan signals supplied through the gate line during the display driving period DP may overlap in a certain period, which causes parasitic capacitance formed between the gate node of the thin film transistor and the touch electrode to accumulate. Here, a case in which distortion of the DC voltage Vcom occurs during the display driving period DP due to overlapping of the third scan signal SCAN3 to the seventh scan signal SCAN7 is illustrated as an example.

This parasitic capacitance increases the load on the touch electrode, causing DC voltage distortion, which may cause a defect such as a horizontal line due to a difference in luminance. In this way, a defect due to an overlap between the load deviation of the touch electrode and the scan signal within the display driving period DP may be referred to as overlap distortion.

Meanwhile, although such overlapping distortion may appear during the display driving period DP, in the case of time free driving in which display driving and touch driving proceed simultaneously, since the scan signal is supplied even during the touch driving period TP, the touch driving period TP ) may also appear. However, since a DC voltage of a direct current level is applied during the display driving period DP and a touch driving signal in a pulse form is applied during the touch driving period TP, the distortion form of the DC voltage may be different.

In the touch display device 100 of the present invention, the overlap distortion due to the overlap of the load deviation of the touch electrode and the scan signal within the display driving period (DP) and the display driving period (DP) and the touch driving period (TP) By distinguishing transition distortion generated in the transition process of and applying different compensation voltages to the corresponding section, defects caused by DC voltage distortion can be resolved and image quality can be improved.

14 is a diagram illustrating an example of distinguishing between an overlapping distortion section and a transition distortion section in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 14 , the touch display device 100 according to embodiments of the present disclosure divides one display frame period into two or more display driving periods DP and two or more touch driving periods TP. Thus, display driving and touch driving can be performed.

In this case, each of two or more blank periods corresponding to two or more touch driving periods TP within one display frame period may be referred to as a long horizontal blank (LHB). Therefore, the touch driving period TP and LHB may be understood as the same concept.

Accordingly, the touch display device 100 of the present disclosure provides an overlap distortion period due to an overlap between the load deviation of the touch electrode TE and the scan signal within the display driving period DP and the display driving period DP. By applying different compensation voltages to the transition distortion section generated during the transition process of the touch drive period (TP) and the touch drive period (TP), defects caused by DC voltage distortion can be eliminated and image quality can be improved.

Overlap distortion, in which the DC voltage Vcom is distorted by the load variation of the touch electrode TE and the overlapping of the scan signal SCAN within the display driving period DP, is caused by overlapping distortion depending on the distance from the touch driving circuit 150. Its size may vary.

For example, the power management circuit 160 is located at the bottom of the display panel 110 and the direct current voltage (Vcom) is applied to the display panel 110 through a source printed circuit board (SPCB) on which the touch driving circuit 150 is mounted. can be supplied to In this case, overlap distortion in which the DC voltage Vcom is distorted by overlapping the load deviation of the touch electrode TE and the scan signal SCAN within the display driving period DP is caused by the touch driving circuit 150. A lower area of the display panel 110 corresponding to a position close to appears small. On the other hand, overlap distortion caused by the scan signal (SCAN) appears large in an upper region of the display panel 110 corresponding to a location far from the touch driving circuit 150 .

This is because the parasitic capacitance formed between the touch electrode TE disposed on the top of the display panel 110 and the gate line GL is larger than that of the touch electrode TE disposed on the bottom of the display panel 110. This is because the load of the touch electrode TE disposed far from the touch driving circuit 150 increases.

In addition, when the DC voltage Vcom supplied from the power management circuit 160 is supplied from the bottom to the top of the display panel 110, the direct current reaching the touch electrode TE disposed on the top of the display panel 110 The level of the voltage Vcom is reduced by the resistance component of the signal line, and a time delay may occur. Accordingly, the direct current voltage Vcom supplied to the touch electrodes TE disposed on the top of the display panel 110 is more greatly affected by the load of the touch electrodes TE, and distortion may increase.

Therefore, within the display driving period DP, the level of the overlap compensation voltage for compensating for the overlap distortion period due to the overlap of the load deviation of the touch electrode TE and the scan signal SCAN and the overlap distortion is the touch driving period. It may be determined in consideration of a positional relationship with the circuit 150 or the power management circuit 160 .

For example, when one display frame period (Display Frame) is divided into 16 display driving periods (DP1 to DP16) and 16 touch driving periods (TP1 to TP16) and alternately proceeds with display driving and touch driving, display Overlapping distortion caused by the scan signal SCAN can be compensated for during a section corresponding to the first touch driving period TP1 and 1LHB to the eighth touch driving period TP8 and 8LHB proceeding from the top of the panel 110 . Level overlap compensation voltage can be supplied.

On the other hand, the transition distortion generated during the transition between the display drive period (DP) and the touch drive period (TP) is the scan signal ( The size may vary according to the overlapping number of SCAN).

For example, when seven gate lines GL correspond to one touch electrode TE, the display driving period DP in which four scan signals SCAN overlap three scan signals SCAN. Transition distortion may appear larger than the display driving period DP.

In addition, when the sizes of the touch electrodes TE are different, such as in the woven type, the transition distortion by the gate line GL corresponding to the long-type touch electrode is reduced by the gate line GL corresponding to the short-type touch electrode. will appear larger than the transition distortion caused by

Therefore, the level of the transition compensation voltage for compensating for the transition distortion generated during the transition between the display driving period DP and the touch driving period TP is the number of overlapping scan signals SCAN in the transition distortion period or It may be determined by considering the shape of the touch electrode TE corresponding to the gate line GL to which the scan signal SCAN is supplied.

For example, when one display frame period (Display Frame) is divided into 16 display driving periods (DP1 to DP16) and 16 touch driving periods (TP1 to TP16) and alternately proceeds with display driving and touch driving, scan The first touch driving period (TP1, 1LHB), the third touch driving period (TP3, 3LHB), and the fifth touch driving period (TP5, 5LHB), in which the signal SCAN overlaps many times, are set as the first transition distortion period. Thus, the first transition compensation voltage may be applied. In addition, the second touch driving period (TP2, 2LHB), the fourth touch driving period (TP4, 4LHB), and the sixth touch driving period (TP6, 6LHB) to the 16th touch driving period in which the number of scan signals SCAN overlaps are small. The second transition compensation voltage may be applied by setting the periods TP16 and 16LHB as the second transition distortion period.

The first transition distortion period in which the scan signals (SCAN) overlap each other and the second transition distortion period in which the scan signals SCAN overlap each other may be determined through a driving test during the manufacturing process of the display panel 110. During the driving process of the panel 110, it may be determined by reflecting the arrangement of the scan signal SCAN and the touch electrode TE.

At this time, since the first transition compensation voltage is applied to a period in which transition distortion is large and the second transition compensation voltage is applied to a period in which transition distortion is small, the level of the first transition compensation voltage is higher than that of the second transition compensation voltage. can be set large.

15 is a diagram illustrating a first transition distortion section in which the number of overlapping scan signals is large and a second transition distortion section in which the number of overlapping scan signals is small in transition distortion in a display device according to embodiments of the present disclosure as an example; .

Referring to FIG. 15 , in the display apparatus 100 according to embodiments of the present disclosure, a display driving period (DP) and a touch driving period are based on adjacent display driving periods (DP(N) and DP(N+1)). The magnitude of transition distortion may vary according to the number of overlapping scan signals (SCAN) in the transition period of (TP).

For example, when seven gate lines GL1 to GL7 correspond to one touch electrode TE and a scan signal supplied through the seven gate lines GL1 to GL7 corresponds to one touch electrode TE, seven gate lines GL1 to GL7 The seven scan signals SCAN1 to SCAN7 applied to ) may be applied during the N th display driving period DP(N) and the N+1 th display driving period DP(N+1).

For example, the first scan signal SCAN1 is applied through the first gate line GL1 during the Nth display driving period DP(N), and the N+1th display driving period DP(N+1) ), the second scan signal SCAN2 to the seventh scan signal SCAN7 may be applied to the second gate line GL2 to the seventh gate line GL7. (In the case of (a) of FIG. 15)

At this time, only the first scan signal SCAN1 exists in the N-th display driving period DP(N), but the second scan signal SCAN2 to SCAN2 exists in the N+1-th display driving period DP(N+1). The seventh scan signal SCAN7 may be overlapped at regular time intervals.

Accordingly, the transition distortion of the DC voltage Vcom appears small in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears large.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the N+1 th display driving period DP(N+1), and the first transition compensation voltage having a low level is applied in the N th display driving period DP(N). 2 A transition compensation voltage can be applied.

In addition, the first scan signal SCAN1 and the second scan signal SCAN2 are applied through the first gate line GL1 and the second gate line GL2 during the Nth display driving period DP(N). During the N+1 th display driving period DP(N+1), the third scan signal SCAN3 to the seventh scan signal SCAN7 are applied to the third gate line GL3 to seventh gate line GL7. can (In the case of (b) of FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 and the second scan signal SCAN2 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), the third scan signal SCAN3 to the seventh scan signal SCAN7 may be overlapped at regular time intervals.

Accordingly, the transition distortion of the DC voltage Vcom appears small in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears large.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the N+1 th display driving period (DP(N+1)) in which the scan signal SCAN overlaps many times, and the scan signal SCAN The second transition compensation voltage of a low level may be applied in the Nth display driving period DP(N) having a small number of overlappings.

In addition, the first to third scan signals SCAN1 to SCAN3 are applied through the first to third gate lines GL1 to GL3 during the Nth display driving period DP(N), In the N+1 th display driving period DP(N+1), the fourth scan signal SCAN4 to the seventh scan signal SCAN7 are applied to the fourth gate line GL4 to seventh gate line GL7. can (In the case of (c) of FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 to the third scan signal SCAN3 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), the fourth scan signal SCAN4 to the seventh scan signal SCAN7 may be overlapped at regular time intervals.

Accordingly, the transition distortion of the DC voltage Vcom appears small in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears large.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the N+1 th display driving period (DP(N+1)) in which the scan signal SCAN overlaps many times, and the scan signal SCAN The second transition compensation voltage of a low level may be applied in the Nth display driving period DP(N) having a small number of overlappings.

In addition, the first to fourth scan signals SCAN1 to SCAN4 are applied through the first to fourth gate lines GL1 to GL4 during the Nth display driving period DP(N). During the N+1th display driving period DP(N+1), the fifth to seventh scan signals SCAN5 to SCAN7 are applied to the fifth to seventh gate lines GL5 to GL7. can (In the case of (d) of FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 to the fourth scan signal SCAN4 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), the fifth scan signal SCAN5 to the seventh scan signal SCAN7 may overlap at regular time intervals.

Accordingly, the transition distortion of the DC voltage Vcom appears large in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears small.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the Nth display driving period DP(N) in which the number of overlapping scan signals SCAN is large, and the number of overlapping scan signals SCAN is small. In the N+1 th display driving period (DP(N+1)), the second transition compensation voltage of a low level may be applied.

In addition, the first scan signal SCAN1 to the fifth scan signal SCAN5 are applied through the first gate line GL1 to fifth gate line GL5 during the Nth display driving period DP(N), In the N+1 th display driving period DP(N+1), the sixth scan signal SCAN6 to the seventh scan signal SCAN7 are applied to the sixth gate line GL6 to seventh gate line GL7. can (In the case of (e) of FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 to the fifth scan signal SCAN5 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), the sixth scan signal SCAN6 to the seventh scan signal SCAN7 may be overlapped at regular time intervals.

Accordingly, the transition distortion of the DC voltage Vcom appears large in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears small.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the Nth display driving period DP(N) in which the number of overlapping scan signals SCAN is large, and the number of overlapping scan signals SCAN is small. In the N+1 th display driving period (DP(N+1)), the second transition compensation voltage of a low level may be applied.

In addition, the first scan signal SCAN1 to the sixth scan signal SCAN6 are applied through the first gate line GL1 to sixth gate line GL6 during the Nth display driving period DP(N), During the N+1 th display driving period (DP(N+1)), the seventh scan signal SCAN7 may be applied through the seventh gate line GL7. (In the case of (f) of FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 to the sixth scan signal SCAN6 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), only the seventh scan signal SCAN7 exists.

Accordingly, the transition distortion of the DC voltage Vcom appears large in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears small.

Therefore, in this case, the first transition compensation voltage having a high level is applied in the Nth display driving period DP(N) in which the number of overlapping scan signals SCAN is large, and the number of overlapping scan signals SCAN is small. In the N+1 th display driving period (DP(N+1)), the second transition compensation voltage of a low level may be applied.

In addition, the first scan signal SCAN1 to the seventh scan signal SCAN7 are applied through the first gate line GL1 to the seventh gate line GL7 during the Nth display driving period DP(N). During the N+1 th display driving period DP(N+1), the scan signal SCAN may not be applied. (In the case of (g) in FIG. 15)

At this time, in the Nth display driving period DP(N), the first scan signal SCAN1 to the seventh scan signal SCAN7 are overlapped at regular time intervals, and the N+1th display driving period DP(N+ In 1)), the scan signal SCAN does not exist.

Accordingly, the transition distortion of the DC voltage Vcom appears large in the Nth display driving period DP(N), but the transition of the DC voltage Vcom in the N+1th display driving period DP(N+1) Distortion appears. don't

Therefore, in this case, the first transition compensation voltage having a high level may be applied in the Nth display driving period DP(N) in which the scan signal SCAN overlaps many times.

In addition, in the touch display device 100 of the present disclosure, the level of the transition compensation voltage for compensating for transition distortion generated during the transition between the display driving period (DP) and the touch driving period (TP) is the transition period. may be determined by considering the shape of the touch electrode TE corresponding to the gate line GL to which the scan signal SCAN is supplied.

16 is a diagram illustrating shapes of touch electrodes corresponding to positions of gate lines in a touch display device according to embodiments of the present disclosure as an example.

Referring to FIG. 16 , in the touch display device 100 according to embodiments of the present disclosure, long-type touch electrodes TE_L long in the horizontal direction and short-type touch electrodes TE_S short in the horizontal direction are woven types. can be placed.

In this way, when the sizes of the touch electrodes TE are different, when the first gate line GL1 to the seventh gate line GL7 are disposed at positions corresponding to the long touch electrode TE_L, the long touch electrode Transition distortion caused by the first scan signal SCAN1 to the seventh scan signal SCAN7 applied through the first gate line GL1 to seventh gate line GL7 greatly increases due to the large load formed on (TE_L). (In the case of (a) of FIG. 16)

On the other hand, when the eighth gate line GL8 to the fourteenth gate line GL14 are disposed at positions corresponding to the short touch electrode TE_S, the eighth gate line GL8 to the fourteenth gate line GL14 are disposed due to the small load formed on the short touch electrode TE_S. Transition distortion due to the eighth scan signal SCAN8 to the fourteenth scan signal SCAN14 applied through the gate line GL8 to the fourteenth gate line GL14 may appear relatively small.

Therefore, in order to compensate for the transition distortion generated during the transition between the display drive period DP and the touch drive period TP, the scan signal ( A first transition compensation voltage of a high level is applied to the section where the SCAN is applied, and a second transition of a low level is applied to the section where the scan signal SCAN is applied to the gate line GL corresponding to the short touch electrode TE_S. A compensation voltage may be applied.

17 is a signal waveform illustrating an example of an overlap compensation voltage applied in a display driving period and a transition compensation voltage applied in a transition period in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 17 , the touch display device 100 according to embodiments of the present disclosure applies an overlap compensation voltage Vcom_ocomp capable of compensating for overlap distortion of a DC voltage Vcom to an overlap distortion period, and applies transition distortion. Transition compensation voltages Vcom_tcomp1 and Vcom_tcomp2 capable of compensating for transition distortion of the DC voltage Vcom may be applied to the section.

That is, the compensation voltage Vcom_comp is applied to the overlapping compensation voltage Vcom_ocomp applied to the overlapping distortion period within the display driving period DP and to the transition distortion period in which the display driving period DP and the touch driving period TP are changed. It can be divided into transition compensation voltages Vcom_tcomp1 and Vcom_tcomp2.

Overlap distortion, in which the DC voltage Vcom is distorted by overlapping the load deviation of the touch electrode TE and the scan signal SCAN within the display driving period DP, occurs at a distance from the touch driving circuit 150. Its size may vary accordingly.

In addition, when the DC voltage Vcom supplied from the power management circuit 160 is supplied from the bottom to the top of the display panel 110, the direct current reaching the touch electrode TE disposed on the top of the display panel 110 The level of the voltage Vcom is reduced by the resistance component of the signal line, and a time delay may occur. Accordingly, the direct current voltage Vcom supplied to the touch electrodes TE disposed on the top of the display panel 110 is more greatly affected by the load of the touch electrodes TE, and distortion may increase.

Therefore, the level of the overlap compensation voltage Vcom_ocomp applied to the overlap distortion period due to the overlap of the load deviation of the touch electrode TE and the scan signal SCAN within the display driving period DP is the touch driving circuit. 150 or the positional relationship with the power management circuit 160.

In addition, the transition distortion generated during the transition process between the display driving period (DP) and the touch driving period (TP) is the number of overlapping scan signals (SCAN) applied in the transition distortion period or the scan signal (SCAN) is supplied. It may vary according to the shape of the touch electrode TE corresponding to the gate line GL.

At this time, since the transition distortion period can be divided into a first transition distortion period in which the scan signal SCAN overlaps a large number of times and a second transition distortion period in which the scan signal SCAN overlaps a small number of times, the first transition compensation voltage Vcom_tcomp1 ) may be applied to a period of high transition distortion, and the second transition compensation voltage Vcom_tcomp2 may be applied to a period of low transition distortion.

In this case, the level of the first transition compensation voltage Vcom_tcomp1 may be set higher than the level of the second transition compensation voltage Vcom_tcomp2.

Alternatively, while maintaining the same level of the first transition compensation voltage Vcom_tcomp1 and the second transition compensation voltage Vcom_tcomp2, the pulse width of the first transition compensation voltage Vcom_tcomp1 is changed to the pulse width of the second transition compensation voltage Vcom_tcomp2. You could also set it larger.

In addition, the touch display device 100 of the present disclosure may separately include a DC voltage compensation line capable of applying the compensation voltage Vcom_comp to the touch electrode TE in order to compensate for distortion of the DC voltage Vcom.

18 is a diagram illustrating examples of a first transition compensation voltage and a second transition compensation voltage applied to a transition distortion period in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 18 , in the touch display device 100 according to embodiments of the present disclosure, in a transition period in which the display driving period DP and the touch driving period TP are changed, the number of overlapping scan signals SCAN or The first transition compensation voltage Vcom_tcomp1 or the second transition compensation voltage Vcom_tcomp2 may be applied by reflecting the degree of transition distortion generated according to the shape of the touch electrode TE.

In the transition distortion section where the transition distortion occurs, the scan signal SCAN has a large number of overlaps, or the first transition distortion section corresponding to the long touch electrode TE_L and the scan signal SCAN have a small number of overlaps, or the short touch electrode ( TE_S), the first transition compensation voltage Vcom_tcomp1 is applied to the first transition distortion period having a large transition distortion, and the second transition compensation voltage Vcom_tcomp2 has a small transition distortion. It may be applied to the second transition distortion period.

In this case, the first transition compensation voltage Vcom_tcomp1 and the second transition compensation voltage Vcom_tcomp2 may have different levels or different pulse widths.

That is, by setting the level of the first transition compensation voltage Vcom_tcomp1 higher than the level of the second transition compensation voltage Vcom_tcomp2, the transition distortion can be effectively compensated (in the case of FIG. 18(a)).

Alternatively, while maintaining the same level of the first transition compensation voltage Vcom_tcomp1 and the second transition compensation voltage Vcom_tcomp2, the pulse width of the first transition compensation voltage Vcom_tcomp1 is changed to the pulse width of the second transition compensation voltage Vcom_tcomp2. It may be set larger. (In the case of FIG. 18 (b))

19 is a block diagram illustrating an example of a circuit generating a compensation voltage in a touch display device according to an embodiment of the present disclosure.

Referring to FIG. 19 , in the touch display device 100 according to an embodiment of the present disclosure, the compensation voltage generation circuit for generating the compensation voltage Vcom_comp includes a first level voltage Vcom1, a second level voltage Vcom2, A multiplexer (MUX) having a third level voltage (Vcom3) and a fourth level voltage (Vcom4) as inputs and having an output signal selected by the first control signal (CTR1) and the second control signal (CTR2); It may consist of a buffer circuit (BUF) that transfers the output signal of (MUX).

The first level voltage Vcom1 is a voltage to be applied to a first transition distortion period having a large transition distortion, and may correspond to a voltage of a high level period higher than the average level of the DC voltage Vcom.

The second level voltage Vcom2 is a voltage to be applied to the second transition distortion period in which the transition distortion is small, and may correspond to a voltage higher than the average level of the DC voltage Vcom and lower than the first level voltage Vcom1. there is.

The third level voltage Vcom3 is a voltage to be applied to the overlapping distortion section, and may correspond to a voltage at a level lower than the average level of the DC voltage Vcom.

The fourth level voltage Vcom4 may correspond to an average level of the DC voltage Vcom.

Therefore, the waveform of the compensation voltage Vcom_comp output from the buffer circuit BUF can be varied in various ways by controlling the waveforms of the first control signal CTR1 and the second control signal CTR2 applied to the multiplexer MUX. There will be.

In this case, the buffer circuit BUF may be omitted from the compensation voltage generation circuit.

The compensation voltage generation circuit may be located within the power management circuit 160 or may be located within the touch driving circuit 150 .

20 is a flowchart illustrating a touch driving method according to embodiments of the present disclosure.

Referring to FIG. 20 , a touch driving method according to embodiments of the present disclosure includes determining overlap distortion of a DC voltage Vcom generated in an overlap distortion section (S100), and a DC voltage Vcom generated in a transition distortion section. ) Determining the transition distortion (S200), dividing the transition distortion period into a first transition distortion period and a second transition distortion period (S300), an overlapping compensation voltage (Vcom_ocomp) applied to the overlapping distortion period, a first Generating a first transition compensation voltage (Vcom_tcomp1) applied to the transition distortion period and a second transition compensation voltage (Vcom_tcomp2) applied to the second transition distortion period (S400), and compensating for the overlapping distortion period and the transition distortion period. A step of applying the voltage Vcom_comp (S500) may be included.

Determining the overlapping distortion of the DC voltage (Vcom) generated in the overlapping distortion section (S100) is the DC voltage by overlapping the load deviation of the touch electrode (TE) and the scan signal (SCAN) within the display driving period (DP). This is the process of judging the overlapping distortion where the distortion of (Vcom) occurs. The overlapping distortion can be detected by detecting the distortion level of the overlapping distortion section and the DC voltage (Vcom) during the manufacturing process of the display panel 110 and storing it in the form of a memory, or during the driving process of the display panel 110, the overlapping distortion section and the DC voltage The degree of distortion of (Vcom) may be detected.

In the step of determining the transition distortion of the DC voltage Vcom generated in the transition distortion section (S200), the gate driving circuit 120 discontinuously operates the DC voltage Vcom due to overlapping of the scan signals SCAN. This is a process of determining the transition distortion in which the distortion of

In the step of dividing the transition distortion period into a first transition distortion period and a second transition distortion period (S300), the touch electrode corresponding to the overlap count of the scan signal SCAN or the gate line GL to which the scan signal SCAN is supplied. This is a process of dividing into a first transition distortion section having a large transition distortion and a second transition distortion section having a small transition distortion in consideration of the shape of (TE).

The first transition distortion period and the second transition distortion period may detect the transition distortion period and the degree of distortion of the direct current voltage (Vcom) during the manufacturing process of the display panel 110 and store them in the form of a memory, or the display panel 110 During the driving process, the distortion range and the degree of distortion of the DC voltage (Vcom) may be detected.

Generating an overlap compensation voltage Vcom_ocomp applied to the overlap distortion period, a first transition compensation voltage Vcom_tcomp1 applied to the first transition distortion period, and a second transition compensation voltage Vcom_tcomp2 applied to the second transition distortion period Step S400 includes an overlapping compensation voltage Vcom_ocomp for compensating for distortion of the DC voltage Vcom occurring in the overlapping distortion section and a first compensation voltage Vcom_ocomp for compensating for distortion of the DC voltage Vcom occurring in the first transition distortion section. 1 transition compensation voltage (Vcom-tcomp1) and the second transition compensation voltage (Vcom-tcomp2) for compensating for the distortion of the DC voltage (Vcom) generated in the second transition distortion section to be applied to the corresponding distortion section. It is a process of creating

The levels of the overlap compensation voltage Vcom_ocomp, the first transition compensation voltage Vcom-tcomp1, and the second transition compensation voltage Vcom-tcomp2 to be applied to each distortion section are stored in a memory, and the compensation voltage generator circuit It may be generated so that it is applied to the corresponding section by

Applying the compensation voltage (Vcom_comp) to the overlapping distortion section and the transition distortion section (S500) includes the overlapping compensation voltage (Vcom-ocomp) generated by the compensation voltage generating circuit, the first transition compensation voltage (Vcom-tcomp1), and 2 This is a process of applying the transition compensation voltage Vcom-tcomp2 to the touch electrode TE to correspond to each distortion section.

As described above, the touch display device 100 of the present disclosure includes an overlapping distortion section in which distortion of the DC voltage Vcom occurs due to overlapping of the load deviation of the touch electrode TE and the scan signal SCAN, and display driving. In the transition process between the period DT and the touch driving period TP, transition distortion sections in which DC voltage Vcom distortion occurs are distinguished, and compensation voltages of different levels are applied to the touch electrodes TE in each distortion section. By applying it, there is an effect of effectively compensating for distortion of the DC voltage Vcom and improving image quality.

A brief description of the embodiments of the present disclosure described above is as follows.

A touch display device 100 according to embodiments of the present disclosure includes a display panel 110 including a plurality of touch electrodes TE; a gate driving circuit 120 supplying a plurality of scan signals SCAN to the display panel 110 through a plurality of gate lines GL; a touch driving circuit 150 that senses touch sensing according to capacitance changes of the plurality of touch electrodes TE; and supplying compensation voltages of different levels to the plurality of touch electrodes TE in an overlapping distortion period within the display driving period DP and a transition distortion period between the display driving period DP and the touch driving period TP. It may include a power management circuit 160 that does.

The plurality of touch electrodes TE may be split-type touch electrodes separated in the same shape.

In the plurality of touch electrodes TE, long-type touch electrodes having a long length and short-type touch electrodes having a short length are alternately disposed in a second direction in the first direction, and the plurality of short-type touch electrodes disposed in the second direction It may be a woven type touch electrode connected to the same line by one touch line.

The compensation voltage Vcom_comp includes an overlap compensation voltage Vcom_ocomp supplied to the overlap distortion section; a first transition compensation voltage (Vcom_tcomp1) supplied to the first transition distortion period; and a second transition compensation voltage Vcom_tcomp2 supplied to the second transition distortion period.

The overlapping distortion section may be a section in which DC voltage distortion occurs due to overlapping of the plurality of scan signals SCAN and a load deviation caused by the plurality of touch electrodes TE.

The overlapping distortion period may correspond to a touch driving period in an area far from the touch driving circuit 150 or the power management circuit 160 in the display panel 110 .

The transition distortion period may be a period in which DC voltage distortion occurs due to overlapping of the plurality of scan signals SCAN in a period in which the gate driving circuit 120 operates discontinuously.

The first transition distortion period is a period in which the overlap count of the plurality of scan signals (SCAN) is greater than a reference among a plurality of display driving periods (DP), and the second transition distortion period is a period during a plurality of display driving periods (DP). Among them, the overlap count of the plurality of scan signals (SCAN) may be less than the reference.

The first transition distortion period may be a period corresponding to a long-type touch electrode having a length in the first direction, and the second transition distortion period may be a period corresponding to a short-type touch electrode having a length short in the first direction. .

The first transition compensation voltage Vcom_tcomp1 may have a higher level than the second transition compensation voltage Vcom_tcomp2.

The first transition compensation voltage Vcom_tcomp1 may have a larger pulse width than the second transition compensation voltage.

The power management circuit 160 outputs a first level voltage corresponding to the first transition compensation voltage Vcom_tcomp1, a second level voltage corresponding to the second transition compensation voltage Vcom_tcomp2, and the overlap compensation voltage Vcom_ocomp. a multiplexer (MUX) that receives a corresponding third level voltage and a fourth level voltage corresponding to the average DC voltage as inputs and selects an output signal by the first control signal and the second control signal; and a compensation voltage generating circuit including a buffer circuit (BUF) transmitting an output signal of the multiplexer (MUX).

The first level voltage, the second level voltage, the third level voltage, and the fourth level voltage may be stored in a memory.

In addition, the touch driving circuit according to embodiments of the present disclosure supplies a touch driving signal to a plurality of touch electrodes TE included in the display panel 110 through a plurality of touch lines TL, and supplies the plurality of touch electrodes to the plurality of touch electrodes. a touch sensing circuit receiving a touch sensing signal from (TE); a touch controller that detects whether a touch is present and calculates touch coordinates according to the touch sensing signal; and compensation voltages Vcom_comp of different levels are applied to the plurality of touch electrodes TE in an overlapping distortion period within the display driving period DP and a transition distortion period between the display driving period DP and the touch driving period TP. ) may include a compensation voltage generation circuit for supplying.

In addition, a touch driving method according to embodiments of the present disclosure includes a gate driving circuit 120 supplying a scan signal SCAN to a display panel 110 including a plurality of touch electrodes TE, and the display panel ( 110) and a touch driving circuit 150 for supplying a touch driving signal and sensing a touch based on a touch sensing signal received in response to the touch driving signal. Determining overlapping distortion of DC voltage generated in the overlapping distortion section (S100); Determining the transition distortion of the DC voltage generated in the transition distortion section (S200); dividing the transition distortion period into a first transition distortion period and a second transition distortion period (S300); An overlap compensation voltage Vcom_ocomp applied to the overlap distortion section, a first transition compensation voltage Vcom_tcomp1 applied to the first transition distortion section, and a second transition compensation voltage Vcom_tcomp2 applied to the second transition distortion section Generating (S400); and applying the compensation voltage to the overlapping distortion section and the transition distortion section (S500).

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, so the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: touch display device
110: display panel
120: gate driving circuit
130: data drive circuit
140: timing controller
150: touch driving circuit
160: power management circuit

Claims (19)

a display panel including a plurality of touch electrodes;
a gate driving circuit supplying a plurality of scan signals to the display panel through a plurality of gate lines;
a touch driving circuit that detects touch sensing according to capacitance changes of the plurality of touch electrodes; and
A touch display device comprising: a power management circuit supplying compensation voltages of different levels to the plurality of touch electrodes in an overlapping distortion period within a display driving period and a transition distortion period between the display driving period and the touch driving period.
According to claim 1,
The plurality of touch electrodes
A touch display device that is a split-type touch electrode separated in the same shape.
According to claim 1,
The plurality of touch electrodes
In the first direction, long-type touch electrodes and short-type touch electrodes are alternately disposed in the second direction, and the plurality of short-type touch electrodes disposed in the second direction are arranged in the same line by one touch line. A touch display device that is a connected woven-type touch electrode.
According to claim 1,
The compensation voltage is
an overlap compensation voltage supplied to the overlap distortion section;
a first transition compensation voltage supplied to the first transition distortion section; and
A touch display device comprising a second transition compensation voltage supplied to a second transition distortion period.
According to claim 4,
The overlapping distortion section is
A touch display device that is a section in which DC voltage distortion occurs due to load deviation by the plurality of touch electrodes and overlapping of the plurality of scan signals.
According to claim 5,
The overlapping distortion section is
A touch display device corresponding to a touch driving period of a region far from the touch driving circuit or the power management circuit in the display panel.
According to claim 4,
The transition distortion section is
The touch display device of claim 1 , wherein a DC voltage distortion occurs due to overlapping of the plurality of scan signals in a period in which the gate driving circuit operates discontinuously.
According to claim 7,
The first transition distortion section is
Among a plurality of display driving periods, a section in which the number of overlapping times of the plurality of scan signals is greater than a reference;
The second transition distortion section is
Among the plurality of display driving periods, the touch display device is a period in which the number of times of overlapping of the plurality of scan signals is less than a reference.
According to claim 7,
The first transition distortion section is
A section corresponding to a long touch electrode having a length in the first direction;
The second transition distortion section is
The display device is a section corresponding to a short touch electrode having a short length in the first direction.
According to claim 4,
The first transition compensation voltage is
A touch display device having a higher level than the second transition compensation voltage.
According to claim 4,
The first transition compensation voltage is
A touch display device having a pulse width greater than the second transition compensation voltage.
According to claim 4,
The power management circuit
A first level voltage corresponding to the first transition compensation voltage, a second level voltage corresponding to the second transition compensation voltage, a third level voltage corresponding to the overlapping compensation voltage, and a fourth level voltage corresponding to an average DC voltage a multiplexer having as an input and an output signal selected by a first control signal and a second control signal; and
A touch display device comprising a compensation voltage generating circuit comprising a buffer circuit transmitting an output signal of the multiplexer.
According to claim 12,
The first level voltage, the second level voltage, the third level voltage and the fourth level voltage are stored in a memory.
a touch sensing circuit supplying touch driving signals to a plurality of touch electrodes included in the display panel through a plurality of touch lines and receiving touch sensing signals from the plurality of touch electrodes;
a touch controller that detects whether a touch is present and calculates touch coordinates according to the touch sensing signal; and
A touch driving circuit comprising: a compensation voltage generation circuit supplying different levels of compensation voltages to the plurality of touch electrodes in an overlapping distortion period within a display driving period and a transition distortion period between the display driving period and the touch driving period.
15. The method of claim 14,
The compensation voltage is
an overlap compensation voltage supplied to the overlap distortion section;
a first transition compensation voltage supplied to the first transition distortion period; and
A touch driving circuit comprising a second transition compensation voltage supplied to a second transition distortion period.
According to claim 15,
The first transition compensation voltage is
A touch driving circuit having a higher level than the second transition compensation voltage.
According to claim 15,
The first transition compensation voltage is
A touch driving circuit having a pulse width greater than the second transition compensation voltage.
15. The method of claim 14,
The compensation voltage generating circuit
a multiplexer that receives the first level voltage, the second level voltage, the third level voltage, and the fourth level voltage as inputs, and selects an output signal by the first control signal and the second control signal; and
A touch driving circuit comprising a buffer circuit transmitting an output signal of the multiplexer.
A gate driving circuit supplying a scan signal to a display panel including a plurality of touch electrodes, a touch supplying a touch driving signal to the display panel, and sensing a touch based on a touch sensing signal received in response to the touch driving signal In the touch driving method of a touch display device including a driving circuit,
Determining overlapping distortion of DC voltage generated in the overlapping distortion section;
Determining the transition distortion of the current voltage generated in the transition distortion section;
dividing the transition distortion period into a first transition distortion period and a second transition distortion period;
generating an overlap compensation voltage applied to the overlap distortion section, a first transition compensation voltage applied to the first transition distortion section, and a second transition compensation voltage applied to the second transition distortion section; and
and applying the compensation voltage to the overlapping distortion section and the transition distortion section.

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